Dell PowerVault MD3420 - Manual (Page 67)

ignores consistency pre-read. If the virtual disk is subsequently migrated back to a RAID level that
supports consistency, the option becomes available again.
NOTE: Enabling the option on overall repository virtual disks without consistency does not affect
the virtual disk. However, the attribute is retained for that overall repository virtual disk if it is ever
changed to one with consistency information.
Setting Snapshot Virtual Disk Repository Virtual Disk Capacity
To increase or decreases the capacity of a snapshot virtual disk repository virtual disk, use the set
snapVirtualDisk command.
A snapshot repository virtual disk is an expandable virtual disk that is structured as a concatenated
collection of up to 16 standard virtual disk entities. Initially, an expandable repository virtual disk has only
a single element. The capacity of the expandable repository virtual disk is exactly that of the single
element. You can increase the capacity of an expandable repository virtual disk by attaching additional
standard virtual disks to it. The composite expandable repository virtual disk capacity then becomes the
sum of the capacities of all of the concatenated standard virtual disks.
A snapshot group repository virtual disk must satisfy a minimum capacity requirement that is the sum of
the following:
• 32 MB to support fixed overhead for the snapshot group and for copy-on-write processing.
• Capacity for rollback processing, which is 1/5000th of the capacity of the base virtual disk.
If you are creating a new repository virtual disk when you run this command, you must enter the name of
a disk group or disk pool from which you want the repository virtual disk. Optionally, you can also define
the capacity of the repository virtual disk. The following capacity values are supported:
• A percentage ( integer value) representing an amount of the base virtual disk capacity.
• A decimal fraction representing a percentage of the base virtual disk capacity.
• A specific size for the repository virtual disk, in units of bytes, KB, MB, GB, or TB.
To increase capacity for a snapshot virtual disk, use the increaseRepository Capacity and
capacity parameter as shown below:
set snapVirtualDisk[“snapVirtualDiskName”] increaseRepositoryCapacity
repositoryVirtualDisks=("repos_xxxx" | repositoryVirtualDisks=(diskGroupName
[capacity=capacityValue]) repositoryVirtualDisks=(diskPoolName
[capacity=capacityValue]))
To decrease capacity, replace increaseRepositoryCapacity with decreaseRepository:
set snapVirtualDisk ["snapVirtualDiskName"] decreaseRepositoryCapacity
count=numberOfVirtualDisks
Setting Snapshot Group Repository Virtual Disk Capacity
To increase or decrease capacity of a snapshot group repository virtual disk, use the same basic
command syntax as shown previously for the virtual disk repository, except use the set snapGroup
command and supply the snapshot group name:
set snapGroup ["snapGroupName"] increaseRepositoryCapacity
(repositoryVirtualDisks="repos_xxxx" | repositoryVirtualDisks=((diskGroupName
[capacity=capacityValue])) | repositoryVirtualDisks=((diskPoolName
[capacity=capacityValue])))
For more information about expanding storage objects, see the Administrator's Guide.
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